A few generations ago, a mysterious phenomenon occurred. Humans now die after 1.5 billion heart beats; half the heart rate they originally had. Schools began teaching students how to control their emotions and regularly preformed heart rate tests.No one is allowed to use more than the number assigned per week.

This is the story of 2 girls that chose to love in this world regardless of their heartbeats.

Bossa goes to an all-boys school, and like that in itself isn't the worst possible scenario for an adolescent boy, his classmates have recently started playing a game where the objective is to make the opponent aroused before they can do the same to you. Bossa finds it all disgusting and pathetic, but his self-proclaimed best friend Akiyama is determined to "defeat" him.

Hinako had always admired and observed this one boy in her class. She admires him so much that she, at the very least, hopes she has something in common with him. Little does she know they're more similar to each other than she thought, for better or for worse.